I know this is somewhat wrong considering how much Halo borrowed from Alien on the first place, but the beginning of the walkthrough, while still on the ship, reminded me so much of the first Master Chief game.
I must say I'm really impressed with that walkthrough by the way. In less than twelve minutes the player went from a bad situation to a really ****ty one. And in that time length I felt overwhelmed thrice! Feels like no matter how big is your arsenal and no matter how powerful are your vehicles, you can't hope to beat the damn aliens. And I was just watching, as all of us.
Plus, the way these aliens move... It's not completely new and I'm not sure how much of it was preprogrammed, but it was very groundbreaking. And it feels like an Alien/Predator movie. The gory action, the funny character, the chuckles. This has just come from a nice looking game to something with seemingly GOTY potential. Well done so far, Gearbox.